BoilerFaultCodes LF High
Boiler Fault Code LF
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code LF appears across 2 boiler brands and 2 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler has failed to ignite after several attempts, meaning it cannot provide heating or hot water. (As reported on Ideal Esprit HE)
Pick your boiler brand for the LF fix
Source
Information for the LF fault code is sourced from the official service / installation manual for each model that displays it. Read more about how we source fault codes →
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 31 August 2026